Passing Session variables to javascript

In an ExpressionEngine template, I'm setting a PHP session variable in a javascript file like this: (Yes, EE will parse the PHP and add plug the values to the javascript)
<?php session_start(); ?>  
function check_someone_else_result(data) {
  waiting_list_flag = false;
   <?php $_SESSION['waiting_list_flag'] = false;  ?>
  if(data.CanBuy=='YES'){
    show_for_someone_else();
  } else {
    waiting_list_flag = true;
   <?php $_SESSION['waiting_list_flag'] = true;  ?>
    $('#sm_content .oblcontent').html($('#waiting_list').html());
    $('#sm_content a.closebtn').click(function(){location.reload(true);});
    $('#sm_content a.yeswaitbtn').click(function(){show_for_someone_else();});
  } // if(data.CanBuy=='YES')
} // function check_someone_else_result

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Now, in the show_for_someone_else() function, I'm redirecting to another page that loads another
javacript file and I'm trying to set a javascript variable to the same value that I set the session
variable to above.
<?php session_start(); ?>
   var CART_URL          = '{site_url}store/checkout/cart/';
   $(document).ready(function(){
     // attach the validationEngine to the form
     $("#voucher_form").validationEngine('attach', {
                      scroll: false
     }); // $("#voucher_form").validationEngine

     // handles the NExt button click
     $('#checkout-step-billing a').click(function(){
      $('#checkout-step-billing .voucher_form').submit();
     }); // $('#checkout-step-billing a').click
    
     // handles keypresses in all the fields in the form to submit the 
     // form when the press enter
     $("#checkout-step-billing .voucher_form input").keypress(function (e) {
      if ((e.which && e.which == 13) || (e.keyCode && e.keyCode == 13)) {
        $('#checkout-step-billing .voucher_form').submit();
        return false;
      } else {
        return true;
      }
     }); // $("#checkout-step-billing .voucher_form input").keypress

     // set the wait_list_flag from the session variable
     var wait_list_flag = <?php $_SESSION['waiting_list_flag']; ?>   
   }); // $(document).ready

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But I am not getting anything at all.

How do I need to do this?
LVL 26
Eddie ShipmanAll-around developerAsked:
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Eddie ShipmanConnect With a Mentor All-around developerAuthor Commented:
@nanharbison,
  I am using Firebug but it would not let me open the javascript file to view the value because it hadn't been rendered.

@Ray,
  Thanks for the demo Ray, but due to the use of ExpressionEngine, it is a little more complicated than that. See below.

@Slick,
  Because ExpressionEngine lets you include PHP in your javascript templates, it will parse the PHP before the javascript is served to the client, hence the value being set using PHP. Adding the forgotten the echo is what makes it work.

All that being said, I did change the way I was doing things in that I created a dummy form, set the fields to the needed values and submitted it to be picked up in the resulting page. It now works exactly as I planned.

Thanks for the look, however.
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Eddie ShipmanConnect With a Mentor All-around developerAuthor Commented:
Ah, crud, forgot to ECHO the session variable value:
var wait_list_flag = <?php echo $_SESSION['waiting_list_flag']; ?>  

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nanharbisonConnect With a Mentor Commented:
Have you tried just echoing $_SESSION['waiting_list_flag'] to see if it is set? And have you used Firebug or another debugger in a browser to see what is happening?
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Ray PaseurConnect With a Mentor Commented:
See if this helps clarify the way the moving parts interact...
http://www.laprbass.com/RAY_temp_eddieshipman.php
<?php // RAY_temp_eddieshipman.php
error_reporting(E_ALL);


// START THE SESSION (DO THIS FIRST, UNCONDITIONALLY, IN EVERY PHP SCRIPT ON EVERY PAGE)
session_start();

// INITIALIZE THE SESSION ARRAY TO SET A DEFAULT VALUE
if (empty($_SESSION["cheese"])) $_SESSION["cheese"] = 1;

// SEE IF THE CORRECT SUBMIT BUTTON WAS CLICKED
if (isset($_POST['fred']))
{
    // ADD ONE TO THE CHEESE
    $_SESSION['cheese']++;
}
// END OF PROCESSING THE FORM



// RECOVER THE CURRENT VALUE FROM THE SESSION ARRAY (MAKES HEREDOC EASIER)
$cheese = $_SESSION['cheese'];

// CREATE THE JAVASCRIPT USING HEREDOC NOTATION
$js = <<<END_JS
<script>
alert("Cheese is $cheese");
</script>
END_JS;

// PUT THE JAVASCRIPT INTO THE BROWSER OUTPUT
echo $js;



// CREATE THE FORM USING HEREDOC NOTATION
$form = <<<ENDFORM
<html>
<head>
<title>EddieShipman Session-to-JavaScript</title>
</head>
<body>
Currently, SESSION["cheese"] contains: $cheese<br/>
<form method="post">
<input type="submit" value="increment this cheese" name="fred"  />
<input type="submit" value="leave my cheese alone" name="john" />
</form>
</body>
</html>
ENDFORM;

// PUT THE FORM INTO THE BROWSER OUTPUT
echo $form;

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Slick812Connect With a Mentor Commented:
greetings EddieShipman, , looked at your code above, I do very much coding using exchange values between PHP and javascript, your code seems to have several invalid assumptions.  First =
waiting_list_flag = false;
   <?php $_SESSION['waiting_list_flag'] = false;  ?>
  if(data.CanBuy=='YES'){
    show_for_someone_else();
  } else {
    waiting_list_flag = true;
   <?php $_SESSION['waiting_list_flag'] = true;  ?>

I can not see your purpose or logic here, no matter what, the $_SESSION['waiting_list_flag'] will always be set to true, in PHP coding there is NO interaction between javascript and PHP, as your code seems to assume. (but I might have missed something? ?), to get javascript values into PHP values, I need AJAX or a HTML form submit.

next, , you have -
var wait_list_flag = <?php echo $_SESSION['waiting_list_flag']; ?>

if $_SESSION['waiting_list_flag'] is set to true or false (not a string), this may not output anything from PHP. I would try
var wait_list_flag = <?php if($_SESSION['waiting_list_flag']) echo 'true'; else echo 'false'; ?>;
      this is untested, but you may get the idea, javascript requires a  ;  at the end of line, you may have forgot to write

Am I getting what you are trying to do here? or am I no headed on this?
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Eddie ShipmanAll-around developerAuthor Commented:
The missing echo was the key, here.
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